Microchip Technology 1PMT5936BE3/TR7

Overview

1PMT5936BE3/TR7 from Microsemi is a 30 V, ±5% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 12.5 mA test current, 28 Ω dynamic impedance, and 1 µA max reverse leakage at 22.8 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.

For engineers reviewing the 1PMT5936BE3/TR7 datasheet, 1PMT5936BE3/TR7 pinout, 1PMT5936BE3/TR7 application, or 1PMT5936BE3/TR7 equivalent, key selection criteria include its 30 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT placement equipment.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its Powermite® package integrates a full metallic bottom and locking tab to ensure low thermal resistance (30°C/W junction-to-TAB1) and reliable heat transfer during sustained 3.0 W operation.

The device exhibits low knee impedance (0.25 Ω) at 0.25 mA, enabling stable regulation even under light-load conditions, and maintains <1 µA reverse leakage up to 22.8 V - critical for low-power standby circuits and precision bias networks.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral locking tab acting as cathode terminal and primary thermal path. Cathode designated by TAB 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Compared with 1PMT5936BE3/TR7, 1N5357B offers higher absolute power rating but poorer thermal efficiency in SMT layouts, while BZX84-C30 sacrifices all thermal and surge capability for miniaturization - making 1PMT5936BE3/TR7 the optimal balance of power density, thermal management, and manufacturability in mid-power SMT designs.

Availability

1PMT5936BE3/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical instrumentation, and telecom DC-DC converters requiring stable component supply with consistent Zener voltage tolerance and thermal performance.

Supply support for 1PMT5936BE3/TR7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, industrial, and communications markets.

The Powermite® Zener diode product line was designed to deliver high-power surface-mount voltage regulation with integrated thermal management - specifically targeting space-constrained, thermally demanding applications where traditional SMT Zeners fail to sustain rated power.

FAQ

What is the Zener voltage tolerance for 1PMT5936BE3/TR7?

The 1PMT5936BE3/TR7 has a standard Zener voltage tolerance of ±5% at 30 V nominal, measured at 12.5 mA test current and TAB 1 temperature of 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, but the base part 1PMT5936BE3/TR7 uses the ±5% grade per Microsemi MSC0995 Rev F specification.

Can 1PMT5936BE3/TR7 be used in place of a through-hole Zener like 1N5357B?

While both 1PMT5936BE3/TR7 and 1N5357B share a 30 V nominal Zener voltage, they differ significantly in package, thermal path, and power derating. The 1PMT5936BE3/TR7 uses a surface-mount Powermite® package with 30°C/W junction-to-tab thermal resistance, whereas 1N5357B is in DO-201AD with ~50°C/W. Direct substitution requires PCB redesign to accommodate the different footprint and thermal pad layout.

What is the maximum reverse voltage before significant leakage occurs in 1PMT5936BE3/TR7?

Per the datasheet, 1PMT5936BE3/TR7 exhibits ≤1 µA reverse leakage current up to 22.8 V. Beyond that voltage, leakage increases nonlinearly toward the 30 V Zener breakdown point. This 22.8 V value corresponds to the rated reverse voltage (V_R) parameter and defines the safe non-conducting operating range for clamping or reference use.

How does the Powermite® package improve thermal performance compared to standard SOD-123 or SOT-23 Zeners?

The Powermite® package of 1PMT5936BE3/TR7 features a full metallic bottom and integral locking tab that serve as a direct thermal conduction path from the silicon junction to the PCB copper. With a measured 30°C/W junction-to-TAB1 thermal resistance, it sustains 3.0 W continuously - far exceeding the ~0.3–0.5 W limits of SOD-123 or SOT-23 packages, which rely solely on lead-frame conduction.

Is 1PMT5936BE3/TR7 compatible with standard reflow soldering profiles?

Yes, 1PMT5936BE3/TR7 is qualified for standard lead-free reflow soldering per J-STD-020. Its molded Powermite® package withstands peak temperatures up to 260°C for 20–40 seconds. The full metallic bottom also promotes uniform heating and minimizes warpage risk during reflow, supporting high-yield automated assembly without special process adjustments.